One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,8)(3,7,4,6)(26,30)(27,31)(32,35)(33,39)(34,38)(36,40)(1,3,5,4)(2,6,8,7)(9,10)(11,17)(12,15)(13,16)(14,19)(18,23)(20,22)(21,24)(25,26,29,30)(27,31,34,38)(28,35,37,32)(33,40,36,39)(9,11,13,19)(10,14,16,17)(12,20,21,18)(15,23,24,22)(25,27,29,34)(26,31,30,38)(28,36,37,33)(32,40,35,39)(1,3,5,4)(2,7,8,6)(9,12,13,21)(10,15,16,24)(11,18,19,20)(14,22,17,23)(25,28,29,37)(26,32,30,35)(27,33,34,36)(31,39,38,40)(1,4,5,3)(2,6,8,7)(10,16)(14,17)(15,24)(22,23)(28,37)(32,35)(33,36)(39,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.